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annotate gcc/testsuite/g++.dg/cpp1y/constexpr-empty4.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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131
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1 // PR c++/81933
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2 // { dg-do compile { target c++14 } }
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3
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4 namespace std {
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5 template <typename _Tp> struct __decay_and_strip { typedef _Tp __type; };
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6 template <int> struct enable_if { typedef int type; };
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7 template <typename _Head> struct _Head_base {
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8 constexpr _Head_base(_Head) {}
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9 };
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10 template <unsigned long, typename...> struct _Tuple_impl;
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11 template <unsigned long _Idx, typename _Head, typename... _Tail>
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12 struct _Tuple_impl<_Idx, _Head, _Tail...> : _Tuple_impl<1, _Tail...>, // { dg-warning "direct base" }
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13 _Head_base<_Head> {
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14 typedef _Tuple_impl<1, _Tail...> _Inherited;
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15 typedef _Head_base<_Head> _Base;
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16 constexpr _Tuple_impl(_Head __head, _Tail... __tail)
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17 : _Inherited(__tail...), _Base(__head) {}
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18 _Tuple_impl(const _Tuple_impl &) = default;
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19 _Tuple_impl(_Tuple_impl &&);
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20 };
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21 template <unsigned long _Idx, typename _Head>
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22 struct _Tuple_impl<_Idx, _Head> : _Head_base<_Head> {
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23 typedef _Head_base<_Head> _Base;
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24 constexpr _Tuple_impl(_Head __head) : _Base(__head) {}
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25 };
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26 template <int> struct _TC {
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27 static constexpr bool _NotSameTuple() { return true; }
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28 };
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29 template <typename... _Elements> class tuple : _Tuple_impl<0, _Elements...> {
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30 typedef _Tuple_impl<0, _Elements...> _Inherited;
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31
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32 public:
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33 template <typename... _UElements,
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34 enable_if<_TC<1>::_NotSameTuple()>::type = false>
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35 constexpr tuple(_UElements... __elements) : _Inherited(__elements...) {}
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36 tuple(const tuple &) = default;
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37 };
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38 template <typename... _Elements>
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39 constexpr tuple<typename __decay_and_strip<_Elements>::__type...>
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40 make_tuple(_Elements... __args) {
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41 typedef tuple<typename __decay_and_strip<_Elements>::__type...> __result_type;
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42 return __result_type(__args...);
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43 }
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44 }
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45 struct any_udt {};
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46 template <typename... Tuples> constexpr auto flatten(Tuples... tuples) {
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47 auto all = std::make_tuple(tuples...);
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48 auto flat(all);
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49 return flat;
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50 }
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51 constexpr auto fail = flatten(any_udt{}, any_udt{});